US3218086A - Dimensionally stabilized synthetic resin sealing ring - Google Patents

Dimensionally stabilized synthetic resin sealing ring Download PDF

Info

Publication number
US3218086A
US3218086A US180612A US18061262A US3218086A US 3218086 A US3218086 A US 3218086A US 180612 A US180612 A US 180612A US 18061262 A US18061262 A US 18061262A US 3218086 A US3218086 A US 3218086A
Authority
US
United States
Prior art keywords
sealing ring
sealing
rings
synthetic resin
stay
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US180612A
Other languages
English (en)
Inventor
Philip F Donley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DONLEY PRODUCTS Inc
Original Assignee
DONLEY PRODUCTS Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE629680D priority Critical patent/BE629680A/xx
Application filed by DONLEY PRODUCTS Inc filed Critical DONLEY PRODUCTS Inc
Priority to US180612A priority patent/US3218086A/en
Priority to GB8323/63A priority patent/GB981651A/en
Priority to DED41109A priority patent/DE1285265B/de
Priority to CH337463A priority patent/CH403416A/de
Application granted granted Critical
Publication of US3218086A publication Critical patent/US3218086A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/36—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/36—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member
    • F16J15/363—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member the diaphragm or bellow being made of metal

Definitions

  • Sealing rings of synthetic resin have been employed heretofore, particularly sealing rings consisting largely or entirely of thermosetting resins; e.g., phenol-formaldehyde, urea-formaldehyde and the like.
  • thermosetting resins e.g., phenol-formaldehyde, urea-formaldehyde and the like.
  • sealing rings consisting wholly or in part of thermoplastic resins, particularly such as are characterized by sufliciently high heat distortion temperatures (200 F. or better) measured under test conditions using a standard load (66 p.s.i.).
  • Examples of synthetic resins of the latter type are the filled and unfilled nylons (sintered and unsintered), polytetrafluoro ethylenes, polychlorotrifluoro ethylenes, polyvinylidene fluorides, polypropylenes, polycarbonates and acetal polymers and copolymers.
  • thermosetting resins tend as a rule to be dimen sionally stable
  • a number of representative thermoplastic resins included among or of the nature of those enumerated above have a tendency to creep under load, thus greatly restricting their usefulness.
  • thermoplastic resin sealing rings conforming to the teachings of the present invention largely or entirely overcome the effect of any latent inability to hold to the desired dimensions while still preserving advantageous properties that are inherent in these and similar thermoplastic resins, especially such desirable properties as good moldability, good machineability and low coefiicients of friction.
  • a principal object of the present invention is to modify the construction of a typical thermoplastic sealing ring in such a way as to stabilize it, particularly if it is one forming part of a sealing unit of one of the kinds described in United States Patents 2,776,851, 2,941,825 and 3,028,- 163 to August H. Heinrich.
  • Certain of the sealing units described in these patents have in common the fact that the sealing rings are provided with frusto-conical surfaces, hereinafter called the holding surfaces, by which they are held in place in cooperating supporting elements with complementary frusto-conical shapes.
  • the angle of taper is in such cases characteristically less than 7 /2 usually about 5.
  • the sealing ring as a whole is of a thermoplastic resin that is not sufficiently stable dimensionally, the sealing ring may tend to become unseated as a result of the tendency of many such materials to creep under conditions of use.
  • the present invention overcomes this disadvantage and makes possible much more widespread use of sealing rings of thermoplastic resins such as those previously mentioned which in other respects have characteristics making for efiiective sealing.
  • FIGURE 1 is a section with parts in elevation showing a projecting shaft end with the sealing unit of the present invention mounted on it.
  • FIGURE 2 is an exploded view of the sealing unit, the parts thereof being shown in section.
  • FIGURE 3 is a section showing one of the two sealing rings with a metal stay ring inserted in the body thereof.
  • FIGURE 4 is an enlargement of a portion of FIG- URE 3.
  • FIGURE 5 is a similar enlargement showing a modification.
  • FIGURES 6 and 7 are views similar to FIGURES 4 and 5, respectively, showing modifications in which a stay ring of slightly different shape is inserted in the sealing ring from the opposite side thereof.
  • FIGURE 1 What is shown in FIGURE 1 is a representative installation in which a sealing unit 1 is interposed between a collet housing 2 and a bushing 3 attached to a machine frame 4.
  • Projecting shaft 5 carries on its reduced outer end So a sheave 6.
  • the available space between sheave 6 and frame 4 accommodates sealing unit 1, which includes a first sealing ring 7 bearing against collet housing 2 and a second sealing ring 8 bearing against bushing 3.
  • the two sealing rings are carried by common supporting means 9 located between them.
  • two like annular metal springs 11 and 12 go to make up such supporting means.
  • Symmetrical sealing units of this general type are disclosed in United States Patent 2,776,851 to August H. Heinrich, granted January 8, 1957. Similar sealing units constructed principally of sheet metal are disclosed in US. Patents 2,941,825 of June 21, 1960, and 3,028,163 of April 3, 1962, both to August H. Heinrich. An improved form of sealing unit is disclosed in US. application Serial No, 70,707, filed November 21, 1960, by Philip F. Donley. In the sealing unit of the present application, the invention has to do largely with the sealing rings, as will appear.
  • springs 11 and 12 are provided with integral mounting flanges 13 and 14 and integral lip-like flanges 15 and 16.
  • Mounting flanges 13 and 14 are designed to telescope as shown in FIGURE 1: a continuous weld (not shown) formed by resistance welding is employed to hold them together.
  • Lip-like flanges 15 and 16 extend oppositely to mounting flanges 13 and 14: they are provided for the dual purpose of holding two secondary leaf springs 17 and 18 in place in the assembly and mounting the metal supporting elements 19 and 20 that carry the sealing rings.
  • Secondary leaf springs 17 and 18, which line the inside faces of primary leaf springs 11 and 12, are clamped in place between lip-like flanges 15 and 16 and supporting elements 19 and 20.
  • Supporting elements 19 and 20 which are attached by continuous welds to flanges 15 and 16, respectively, are generally annular but of channel-shaped cross section. It will be noted that the peripheral flanges forming inside walls 21 and 22 of the channels are inclined to the central axis of the sealing unit. This inclination is exaggerated in FIGURES 1 and 2 in the interests of clarity. In practice, the angles between sidewalls 21 and 22 and the central axis of sealing unit 1 are about 4, although they may be somewhat more or somewhat less. Thus the inside walls of supporting elements 19 and 20 are frusto-conical in shape.
  • Sealing rings 7 and 8 which are preferably of glassfilled polytetrafluoroethylene, are characterized, among other things, by axially directed flanges 23 and 24 and, immediately to the rear thereof, by frusto-conical holding surfaces 25 and 26 that form part of the outer peripheries of the sealing rings. Holding surfaces 25 and 26 are designed for cooperation with the frusto-conical side walls of supporting elements 19 and 20 and are therefore tapered in complementary fashion; i.e., they define angles of about 4 to the central axis of the sealing unit. By so 3 relating these parts, sealing rings 7 and 8 are caused to adhere tenaciously to supporting elements 19 and 20.
  • sealing rings 7 and 3 are on the ends of flanges 23 and 2d; i.e., where the flanges bear against collet housing 3 and bushing 4. inwardly thereof, sealing rings 7 and 8 are recessed to provide shallow cylindrical hollows, the bottoms of which are defined by shoulder in sealing ring 7 and shoulder 30 in sealing ring 8. Beyond shoulders 29 and 30, sealing rings '7 and J are further recessed as shown in FIGURE 2 to provide annular chambers 3i and 32, the latter serving as means for the reception of the stay rings hereinafter to be described.
  • chambers 31 and 32 are flared slightly to facilitate entry of the stay rings, although chambers 31 and 32 may be annular in the literal sense. It will be noted that chambers 31 and 32 lie inwardly of frusto-cylindrical holding surfaces 25 and 2-5 on sealing rings 7 and 8.
  • Stay rings are preferably of stainless steel but may be of any other metal or material having suitable physical characteristics. They are so shaped as to correspond to the shape of chambers 31 and 32 in sealing rings 7 and 8. Normally, however, they are oversize in the sense that their outer peripheral faces, whether or not tapered, measure a few thousandths of an inch more in diameter than walls 33 and 34 of chambers 31 and 32. This difference, which is too small to appear in the drawings, may be as little as one thousandth or as much as five-thousandths of an inch. Similarly, the inner peripheral faces of the stay rings measure slightly less in diameter, from one-thousandth to fivethousandths of an inch, than the corresponding walls of the chambers 31 and 32. Thus the stay rings, measured on both inner and outer peripheries, are oversize, as compared with the chambers into which they are to be inserted.
  • tapered face 37, fiat bottom face 38 and cylindrical face 39 are machined to a smooth finish to permit them to bear snugly against the side and bottom Walls of chamber 32 in sealing ring 8.
  • Stay rings 35 and 36 may be inserted in any suitable way in chambers 31 and 32 in sealing rings 7 and 8, if need be with the assistance of a tool adapted to urge them into place in the chambers.
  • the flared shape of the outer peripheries of the stay rings and chambers facilities entry and seating of the stay rings; however, absence of the fiared shape does not prevent proper seating, particularly if a tool is used to make sure that the stay rings are properly seated.
  • the sheet of introducing the stay rings into the chambers in the sealing rings is to exert radial forces toward the outside and inside peripheries of the sealing rings. These forces continue to exert themselves during the useful life of the sealing rings. They have a stabilizing effect on the polytetrafiuoroethylene of which the sealing rings are made, largely or entirely eliminating creep.
  • FIGURE 3 shows a completely assembled sealing ring in central section, as does the fragmentary detail of FIGURE 4.
  • FIGURE 5 shows a sealing ring 3 similar to sealing ring 8 in which, however, the outer peripheral face of the sealing ring is cylindrical rather than tapered as in FIG- URE 4.
  • the inner peripheral face 40 of the sealing ring is tapered as shown in order to provide a holding surface permitting the use of supporting means designed to support sealing ring 8 from its inner periphery, as in certain of the previously mentioned Heinrich patents.
  • the stay ring of FIGURE 5, like that of Fi"- URE l, is provided with a frusto-conical outer face 37, fiat bottom face and a cylindrical inner face 39.
  • sealing rings 42 and 42' correspond generally to sealing rings 8 and 8.
  • the sealing surface, here designated 43 is disposed as before on the exposed end of a peripheral flange, here designated 44.
  • the holding surfaces, designated 45 and 46, are respectively on the outside and inside peripheries of sealing rings 4-2 and 42'.
  • Stay rings 4-7 are square cornered, each having a flat bottom face 48 and cylindrical inner and outer peripheral faces 4'9 and 50. As compared with stay rings 36, they ar inserted from and received in chambers on the opposite side of the sealing rings. Otherwise, stay rings 47 are similar to stay rings 35. Like the latter, stay rings 4-7 are oversize in relation to the chambers in which they are received.
  • sealing rings 7 and 8 In a typical case in which the projecting portion of shaft 5 has a diameter of 1 /8 inches, the maximum diameters of sealing rings 7 and 8; i.e., the outer diameters of peripheral flanges 23 and 24, will be 1.344 inches.
  • the inner diameters will be very slightly greater than the diameter of the shaft, enough to permit the sealing rings to ride on the shaft with a clearance of 0.005 to 0.020 inch.
  • sealing rings 7 and 8 may in such case have an overall length of 0.325 inch.
  • the shallow cylindrical recess defined by shoulder 29 or shoulder 30, as the case may be, may have an altitude of 0.115 inch and a diameter of 1.675 inches.
  • Peripheral flanges 23 and 2 therefore will have an altitude of 0.115 inch and a thickness of 0.169 inch. Measured from front to rear, stay rings 35 and 36 should be of the same altitude as the chambers in which they are to be received; i.e., 0.115 inch. In the preferred embodiment of the invention; viz., in the case of sealing rings 7 and 8 of FIGURES 1 to 4, the inner and maximum outer peripheries of the stay rings may measure 1.473 and 1.670 inches, respectively.
  • sealing rings of commercial glass-filled polytetrafiuoroethylene which is subject to creep but as regards flatness retention, coefficient of friction, machineability and moldability is nevertheless a highly desirable material for use in a sealing ring.
  • filled and unfilled polytetrafluoroethylenes may be used filled and unfilled polychlorotrifluoroethylenes, polyvinylidene fluorides, polypropylenes, polycarbonates, acetal polymers, nylons and similar thermoplastic resins with suitably high heat distortion temperatures. As determined under a load of 66 lbs.
  • this temperature should, if possible, be well above 200 F; e.g., 250 to 300 F. In the absence of load, the material should be able to resist continuous temperatures of 250 or more, preferably 350 to 450 F. Filled resins usually meet these requirements better than the corresponding unfilled resins.
  • fillers insofar as concerns the fillers, so long as they are in the category of reinforcing fillers or reinforcements they may be fibrous or non-fibrous, crystalline or amorphous,
  • ietallic or non-metallic, organic or inorganic examples include glass in the form of chopped fibers, asbestos, sisal, filamentous nylon and the like, although rovings, mascerated fabrics and cloth may be used.
  • suitable reinforcing fillers are glass in the form of chopped fibers, asbestos, sisal, filamentous nylon and the like, although rovings, mascerated fabrics and cloth may be used.
  • non-fibrous fillers are finely divided carbon, molybdenum disulphide, quartz, zirconium, copper and other metals. Used in amounts up to about of the weight of the resin, as in conventional glass-filled polytetrafluoroethylene, these and analogous fillers assist and are assisted by the stay ring in minimizing creep under load, preventing cold shrinkage, and maintaining dimensional stability generally.
  • the invention has been described as applied to scaling rings designed for use in sealing units of the kinds shown, described and claimed in the previously mentioned Heinrich patents, the use of frusto-conical holding surfaces on the inner or outer peripheries of the sealing rings is not an indispensable feature of the invention.
  • the features of the invention may be used to good advantage with a sealing ring of thermoplastic resin having a shape that is strictly annular; i.e., with cylindrical inner and outer peripheries and fiat front and rear faces.
  • a dimensionally stabilized sealing ring comprising a synthetic resin annulus characterized on one of the two sides thereof by a fiat sealing surface disposed between the inner and outer peripheries of the sealing ring as a whole, said flat sealing surface lying in a plane extending at right angles to the central axis of the sealing ring; a holding surface on one of the two peripheries of the sealing ring, said holding surface being disposed between said flat sealing surface and the opposite side of the annulus; means in the body of the sealing ring itself between the two sides thereof forming an annular opening of generally cylindrical shape for the reception of a stabilizing element; and, securely lodged in said opening, a continuous rigid member of generally cylindrical shape the inner and outer peripheries of which are of smaller and larger diameter, respectively, than the corresponding surfaces of said opening.
  • a dimensionally stabilized synthetic resin sealing ring according to claim 1 wherein the opening in the body of the sealing ring fronts toward the surface to be sealed.
  • a dimensionally stabilized synthetic resin sealing ring according to claim 1 wherein the opening in the body of the sealing ring fronts toward the side of the sealing ring opposite the surface to be sealed.
  • a dimensionally stabilized synthetic resin sealing ring according to claim 1 wherein, in order to facilitate entry of the stabilizing element, the opening in the body of the sealing ring flares outwardly toward one of the two sides of the sealing ring.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Gasket Seals (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
US180612A 1962-03-19 1962-03-19 Dimensionally stabilized synthetic resin sealing ring Expired - Lifetime US3218086A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE629680D BE629680A (en)van) 1962-03-19
US180612A US3218086A (en) 1962-03-19 1962-03-19 Dimensionally stabilized synthetic resin sealing ring
GB8323/63A GB981651A (en) 1962-03-19 1963-03-01 Sealing rings and sealing units containing them
DED41109A DE1285265B (de) 1962-03-19 1963-03-12 Gleitring
CH337463A CH403416A (de) 1962-03-19 1963-03-18 Dichtungseinheit mit mindestens einem Dichtungsring aus thermoplastischem Kunststoff

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US180612A US3218086A (en) 1962-03-19 1962-03-19 Dimensionally stabilized synthetic resin sealing ring

Publications (1)

Publication Number Publication Date
US3218086A true US3218086A (en) 1965-11-16

Family

ID=22661103

Family Applications (1)

Application Number Title Priority Date Filing Date
US180612A Expired - Lifetime US3218086A (en) 1962-03-19 1962-03-19 Dimensionally stabilized synthetic resin sealing ring

Country Status (5)

Country Link
US (1) US3218086A (en)van)
BE (1) BE629680A (en)van)
CH (1) CH403416A (en)van)
DE (1) DE1285265B (en)van)
GB (1) GB981651A (en)van)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367544A (en) * 1966-06-27 1968-02-06 Firestone Tire & Rubber Co Dispensing device having sealing means
US3515393A (en) * 1966-10-11 1970-06-02 Pioneer Oilsealing & Moulding Face seals
US3810635A (en) * 1972-03-20 1974-05-14 Tec Group Mechanical seal
US3824662A (en) * 1971-02-08 1974-07-23 Nippon Piston Ring Co Ltd Process for producing an oil seal to be applied to the rotary piston engine
US3969451A (en) * 1971-05-17 1976-07-13 The Wickes Corporation Mechanical seals
US6962339B1 (en) 1999-12-07 2005-11-08 Infinity Manufacturing, Inc. Bellows type mechanical seal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2881015A (en) * 1956-03-15 1959-04-07 Gits Bros Mfg Co Shaft seal means and method
US2941825A (en) * 1954-11-26 1960-06-21 Heinrich Adeline Sealing system for bearings, shafts, etc.
US3058718A (en) * 1958-07-23 1962-10-16 Knowles Fisher Corp Valve and sealing means therefor
US3100648A (en) * 1960-11-17 1963-08-13 Consolidation Coal Co Fluid seal

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1711744U (de) * 1955-08-23 1955-11-24 Schwartz & Co G Dichtungsring, insbesondere fuer walzwerkslagerungen.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941825A (en) * 1954-11-26 1960-06-21 Heinrich Adeline Sealing system for bearings, shafts, etc.
US2881015A (en) * 1956-03-15 1959-04-07 Gits Bros Mfg Co Shaft seal means and method
US3058718A (en) * 1958-07-23 1962-10-16 Knowles Fisher Corp Valve and sealing means therefor
US3100648A (en) * 1960-11-17 1963-08-13 Consolidation Coal Co Fluid seal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367544A (en) * 1966-06-27 1968-02-06 Firestone Tire & Rubber Co Dispensing device having sealing means
US3515393A (en) * 1966-10-11 1970-06-02 Pioneer Oilsealing & Moulding Face seals
US3824662A (en) * 1971-02-08 1974-07-23 Nippon Piston Ring Co Ltd Process for producing an oil seal to be applied to the rotary piston engine
US3969451A (en) * 1971-05-17 1976-07-13 The Wickes Corporation Mechanical seals
US3810635A (en) * 1972-03-20 1974-05-14 Tec Group Mechanical seal
US6962339B1 (en) 1999-12-07 2005-11-08 Infinity Manufacturing, Inc. Bellows type mechanical seal

Also Published As

Publication number Publication date
GB981651A (en) 1965-01-27
DE1285265B (de) 1968-12-12
CH403416A (de) 1965-11-30
BE629680A (en)van)

Similar Documents

Publication Publication Date Title
US3218086A (en) Dimensionally stabilized synthetic resin sealing ring
US2700581A (en) Precision fit for bearings and the like
US3167322A (en) Seal
US3680874A (en) Flexible pneumatic duct connectors assembled with internal seals
EP0157904B1 (de) Kassettendichtung
US3438388A (en) Fully lined valve
US3995868A (en) Polytetrafluoroethylene lip seal
NZ245515A (en) Boss arrangement for filament wound pressure vessel with non-metallic liner
US3556617A (en) Piston rod seal for shock absorbers
US3726504A (en) Corrosion resistant valving edge for butter-fly valve disc
US4948320A (en) Preventing movement of an article along a shaft or bore
GB2085555A (en) Valve
US2992868A (en) Mounting sleeve
GB2070702A (en) Method of making a floating sheath of a mechanical seal
CN111868397B (zh) 滑动轴承及其制造方法
EP0226845B1 (en) Single component seal
US3597820A (en) Method of making fully lined valve
US5971622A (en) Divided type rolling bearing unit
US4175753A (en) Mechanical seal
US4809870A (en) Inserts for fixing into openings
US3861764A (en) Bearing assembly and bearing bushing therefor
US3482890A (en) Bearing
US6948515B2 (en) Carbon rupture disk assembly
US3507504A (en) Shaft-sealing system
US3028163A (en) Sealing systems for bearings, shafts, etc.